day3: little more touch-up

1 files changed, 9 insertions, 20 deletions

diff --git a/day3/part2.clj b/day3/part2.clj
index cbbe35f..00e656f 100644
--- a/day3/part2.clj
+++ b/day3/part2.clj
@@ -1,13 +1,12 @@
+(require '[clojure.string :as str])
+
 (def bitcount 12)
 (def input
-  (loop [tot []]
-    (let [line (read-line)]
-      (if (empty? line)
-        tot
-        (recur (conj tot (Integer/parseInt line 2)))
-        )
+  (->> "./in"
+      (slurp)
+      (str/split-lines)
+      (map #(Integer/parseInt % 2))
       )
-    )
   )
 
 (defn countbit [lst bit]
@@ -16,27 +15,17 @@
        (apply +)
        )
   )
+
 (defn filterbit [lst bit v]
   (if (= 1 (count lst))
     lst
-    (loop [l lst r []]
-      (if (empty? l)
-        r
-        (recur
-          (rest l)
-          (if (= (bit-test (first l) bit) v)
-            (conj r (first l))
-            r
-            )
-          )
-        )
-      )
+    (filter #(= (bit-test % bit) v) lst)
     )
   )
 
 (loop [bit (dec bitcount) lst0 input lst1 input]
   (if (and (= 1 (count lst0)) (= 1 (count lst1)))
-    (println (* (first lst0) (first lst1)))
+    (println (map * lst0 lst1))
     (recur
       (dec bit)
       (filterbit lst0 bit (>= (countbit lst0 bit) (/ (count lst0) 2)))